Visualization¶

In this notebook example, we'll take a look at Datumaro visualization Python API. Specifically, we are going to provide the example codes for instance segmentation and captioning tasks with MS-COCO 2017 dataset.

Prerequisite¶

Download COCO 2017 validation dataset¶

In [2]:
!mkdir coco_dataset
!curl http://images.cocodataset.org/zips/val2017.zip --output coco_dataset/val2017.zip --silent
!curl http://images.cocodataset.org/annotations/annotations_trainval2017.zip --output coco_dataset/annotations_trainval2017.zip --silent
!curl http://images.cocodataset.org/annotations/panoptic_annotations_trainval2017.zip --output coco_dataset/panoptic_annotations_trainval2017.zip --silent

  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  777M  100  777M    0     0  2997k      0  0:04:25  0:04:25 --:--:-- 7251k0:31  0:00:10  0:20:21  913k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  241M  100  241M    0     0  3601k      0  0:01:08  0:01:08 --:--:-- 4707k
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  820M  100  820M    0     0  3661k      0  0:03:49  0:03:49 --:--:-- 4215k

Extract the downloaded dataset¶

We extract all the downloaded files and only remain val2017 subset by removing train2017 annotation files. After running this cell, you will get the following directory structure.

coco_dataset
├── annotations
│   ├── captions_val2017.json
│   ├── instances_val2017.json
│   ├── panoptic_val2017
│   ├── panoptic_val2017.json
│   └── person_keypoints_val2017.json
├── images
│   └── val2017
In [1]:
!unzip -q coco_dataset/val2017.zip -d coco_dataset/images
!unzip -q coco_dataset/annotations_trainval2017.zip -d coco_dataset
!unzip -q coco_dataset/panoptic_annotations_trainval2017.zip -d coco_dataset
!unzip -q coco_dataset/annotations/panoptic_val2017.zip -d coco_dataset/annotations
!find coco_dataset -name "*_train2017.json" | xargs rm

Visualize dataset¶

Visualize COCO instance segmentation dataset¶

In [1]:
# Copyright (C) 2021 Intel Corporation
#
# SPDX-License-Identifier: MIT

import datumaro as dm
from datumaro.components.visualizer import Visualizer

dataset = dm.Dataset.import_from("coco_dataset", format='coco_instances')
print("Subset candidates:", dataset.subsets().keys())
subset = list(dataset.subsets().keys())[0] # val2017
print("Subset:", subset)

WARNING:root:File 'coco_dataset/annotations/panoptic_val2017.json' was skipped, could't match this file with any of these tasks: coco_instances
WARNING:root:File 'coco_dataset/annotations/person_keypoints_val2017.json' was skipped, could't match this file with any of these tasks: coco_instances
WARNING:root:File 'coco_dataset/annotations/captions_val2017.json' was skipped, could't match this file with any of these tasks: coco_instances

Subset candidates: dict_keys(['val2017'])
Subset: val2017
In [2]:
def get_ids(dataset: dm.Dataset, subset: str):
    ids = []
    for item in dataset:
        if item.subset == subset:
            ids += [item.id]
    
    return ids

ids = get_ids(dataset, subset)
print("DatasetItem ids:", ids[:4])

DatasetItem ids: ['000000397133', '000000037777', '000000252219', '000000087038']

In this cell, we only draw 4 images (ids[:4]) without any annotations (setting alpha=0).

In [3]:
visualizer = Visualizer(dataset, figsize=(16, 12), alpha=0)
fig = visualizer.vis_gallery(ids[:4], subset, (None, None))
fig.show()

In this time, we'll draw polygon annotations (instance segmentation task) by setting alpha=0.7. It will automatically infer the grid size of gallery as (2, 2) from the number of input samples.

In [4]:
visualizer = Visualizer(dataset, figsize=(16, 12), alpha=0.7)
fig = visualizer.vis_gallery(ids[:4], subset, grid_size=(None, None))
fig.show()

In this example, we draw 4 samples in a row. Thus, the gallery has a (1, 4) grid by giving grid_size=(1, 4).

In [5]:
visualizer = Visualizer(dataset, figsize=(16, 8), alpha=0.7)
fig = visualizer.vis_gallery(ids[:4], subset, grid_size=(1, 4))
fig.show()

It is also possible to visualize a sample one by one.

In [6]:
fig = visualizer.vis_one_sample(ids[5], subset)
fig.show()

Visualize COCO panoptic segmentation dataset¶

In [8]:
dataset = dm.Dataset.import_from("coco_dataset", format='coco_panoptic')
ids = get_ids(dataset, subset)
print("DatasetItem ids:", ids[5:9])

visualizer = Visualizer(dataset, figsize=(16, 12), alpha=0.5)
fig = visualizer.vis_gallery(ids[5:9], subset, grid_size=(None, None))
fig.show()

WARNING:root:File 'coco_dataset/annotations/instances_val2017.json' was skipped, could't match this file with any of these tasks: coco_panoptic
WARNING:root:File 'coco_dataset/annotations/person_keypoints_val2017.json' was skipped, could't match this file with any of these tasks: coco_panoptic
WARNING:root:File 'coco_dataset/annotations/captions_val2017.json' was skipped, could't match this file with any of these tasks: coco_panoptic

DatasetItem ids: ['000000403385', '000000006818', '000000480985', '000000458054']

Visualize COCO captions dataset¶

In [9]:
dataset = dm.Dataset.import_from("coco_dataset", format='coco_captions')
ids = get_ids(dataset, subset)
print("DatasetItem ids:", ids[20:24])

visualizer = Visualizer(dataset, figsize=(16, 12), alpha=0.7)
fig = visualizer.vis_gallery(ids[20:24], subset, grid_size=(None, None))
fig.show()

WARNING:root:File 'coco_dataset/annotations/panoptic_val2017.json' was skipped, could't match this file with any of these tasks: coco_captions
WARNING:root:File 'coco_dataset/annotations/instances_val2017.json' was skipped, could't match this file with any of these tasks: coco_captions
WARNING:root:File 'coco_dataset/annotations/person_keypoints_val2017.json' was skipped, could't match this file with any of these tasks: coco_captions

DatasetItem ids: ['000000143931', '000000303818', '000000463730', '000000460347']